Are my tanks full and everyone compatible?

lmao. I first thought you said you had a vampire tetra in your 10 gallon. My eyes got pretty wide. I was thinking your fish were so screwed. Anyways...

Most people recommend a little larger for the dwarf gouramis. 5-10 gallons is usually pretty good. But, being you havent overstocked your tanks... Ill give you a thumbs up. lmao.

Its much easier to start with a larger tank though. It takes much longer for water parameters to change. Smaller tanks can change in a 30 minutes to a few hours. Larger tanks can take days for parameters to change enough to be worrisome.

But anywho... As long as you set up that larger tank, youll be fine. The silver dollars, the cardinals, and the rummynoses are all schooling fish and should be kept in groups of at least 6. I was in Petsmart the other day (for some reason...) and their signs do say groups of 3... But, 6 is generally the recommended number for a school.

Other than that, everything seems fine. I dont know how big vampire shrimp get, but as long as they can avoid the mouth of a 5-6 inch silver dollar, he'll be fine.

Dont even consider live plants. lmao. Unless its for the silver dollar to eat. These things have a horrible reputation for just completely ravaging any type of living underwater plant.

Twelve fish in a 10 gallon is too many and four fish in a 2.5 gallon is too many, particularly with big bodied fish as part of the mix.

2.5 gallons is really too small for most fish. A pair of same sex mollies, guppies, swordtails or platies would be acceptable, as would a male betta, but that's about it.

In the ten gallon, the gourami and a school of six tetras with one or two shrimp OR snails would have been good.

The most commonly recognized rule is one inch of fish to the gallon. This is usually okay. You can be certain that if the number of fish exceeds the number of gallons, you've got too many, because any fish will reach an inch in length. Robust fish will require even more room, which needs accounting for.

Keep these tanks well looked after - keep up on weekly water changes, follow proper feeding practice, and test often - until you can upgrade to larger aquariums, and watch the number of fish you add when you do upgrade so that you don't over stock.

More fish = more waste = more ammonia = less fish

All in all, it's not a big deal. People have made bigger mistakes, and as long as you keep on top of things and follow through with your tank upgrade, you needn't worry.

it seems alright...just watch out cuz the gourami might take a shrimp if it gets to hungry..and silver dollars like to be with other silver dolar fish but it seems like its making a school with the gourami..but your tanks seem good..by the way cardinal tetras are awesome!

Everything sounds fine.